定时任务逻辑优化

backend/task_scheduler/requirements.txt

@@ -1,6 +1,5 @@
-# Weibo-HotSign Task Scheduler Service Requirements
-# Task Queue
-celery==5.3.6
+# Weibo-HotSign Task Scheduler
+apscheduler==3.10.4
 redis==5.0.1
 
 # Database
@@ -14,11 +13,10 @@ pydantic-settings==2.0.3
 # HTTP Client
 httpx==0.25.2
 
-# Cron parsing
+# Cron parsing (APScheduler 内置，但显式声明)
 croniter==2.0.1
 
 # Crypto (for cookie decryption)
-cryptography==41.0.7
 pycryptodome==3.19.0
 
 # Utilities